Yep, I can see it.
You get to that final door before the last boss in the raid. Everyone clicks on the door and gets a $ over their head. The game opens up a dialog asking you for $1 to continue the raid...
Definitely possible in this game's future.
Worse yet EA's spin doctors will be going on about how it's a revolutionary step and that they are leading the way of the future of the f2p model.